:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1d1d1f;
  --fg-muted: #6e6e73;
  --accent: #5b8c5a;
  --rule: rgba(0, 0, 0, 0.08);
  --code-bg: #f5f5f7;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --fg: #f5f5f7;
    --fg-muted: #a1a1a6;
    --rule: rgba(255, 255, 255, 0.12);
    --code-bg: #1c1c1e;
  }
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 24px 96px;
}

header.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 24px;
  border-bottom: 1px solid var(--rule);
  position: sticky;
  top: 0;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  z-index: 10;
}

.brand {
  font-weight: 600;
  font-size: 17px;
  color: var(--fg);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.brand-mark {
  color: var(--accent);
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--fg-muted);
}

.lang-switch select {
  font: inherit;
  color: var(--fg);
  background: var(--code-bg);
  border: 1px solid var(--rule);
  border-radius: 8px;
  padding: 6px 10px;
  cursor: pointer;
}

h1 {
  font-size: 34px;
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-weight: 700;
  margin: 0 0 8px;
}

h2 {
  font-size: 22px;
  line-height: 1.3;
  letter-spacing: -0.01em;
  font-weight: 600;
  margin: 40px 0 12px;
}

h3 {
  font-size: 18px;
  font-weight: 600;
  margin: 24px 0 8px;
}

p,
ul,
ol {
  margin: 0 0 16px;
}

ul,
ol {
  padding-left: 24px;
}

li {
  margin-bottom: 6px;
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
}

a:hover {
  border-bottom-color: var(--accent);
}

.meta {
  color: var(--fg-muted);
  font-size: 14px;
  margin-bottom: 32px;
}

hr {
  border: none;
  border-top: 1px solid var(--rule);
  margin: 48px 0;
}

code,
pre {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 0.9em;
  background: var(--code-bg);
  border-radius: 6px;
}

code {
  padding: 2px 6px;
}

footer.site-footer {
  border-top: 1px solid var(--rule);
  padding: 32px 24px;
  text-align: center;
  color: var(--fg-muted);
  font-size: 13px;
}

footer.site-footer a {
  color: var(--fg-muted);
  border-bottom-color: transparent;
  margin: 0 8px;
}

footer.site-footer a:hover {
  color: var(--fg);
  border-bottom-color: var(--rule);
}